package com.tedu.api;

import org.junit.Test;

import java.util.Locale;

public class 作业 {
    //1.输出字符串"HelloJava"的字符串长度
    @Test
    public void textLength() {
        String str = "HelloJava";
        System.out.println(str.length());
    }
    //2.输出"HelloJava"中o的位置
    @Test
    public void textIndexOf() {
        String str = "HelloJava";
        int index = str.indexOf("o");
        System.out.println("输出下标位："+index);
        //3.输出"HelloJava"中下标为5处开始第一次出现以"o"的位置
        index=str.indexOf("o",5);
        System.out.println("下标为5处开始第一次出现以的位置:"+index);
    }
    //4.截取"HelloJava"中"Hello"并输出
    @Test
    public void textSubString() {
        String url = "HelloJava";
        url = url.substring(0, 5);
        System.out.println("截取子字符串：" + url);
    }
    //5.截取"HelloJava"中"Java"并输出
    @Test
    public void textSubString2() {
        String url = "HelloJava";
         url = url.substring(5);
         System.out.println("截取子字符串，截取到最后:" + url);
        }
    //6.将字符串" Hello "中两边的空白去掉后输出
    @Test
    public void testTrim(){
        String str=" Hello ";
        str=str.trim();
        System.out.println();
        System.out.println("去掉空格："+str);
    }
    //7.输出"HelloJava"中第6个字符"J"
    @Test
    public void testCharAt(){
        String str="HelloWorld";
        char c=str.charAt(6);
        System.out.println("获取对应字符："+c);
    }
    //8.将"HelloJava"转换为小写，然后转换为大写
    @Test
    public void testTrim2(){
        String str="HelloJava";
        str=str.trim().toLowerCase();
        System.out.println("小写："+str);
        str=str.trim().toUpperCase();
        System.out.println("大写："+str);
    }


    }

